By injecting false data through compromised sensors, an adversary can drive the probability of detection in a sensor network-based spatial field surveillance system to arbitrarily low values. As a countermeasure, a small subset of sensors may be secured. Leveraging the theory of Matched Subspace Detection, we propose and evaluate several detectors that add robustness to attacks when such trusted nodes are available. Our results reveal the performance-security tradeoff of these schemes and can be used to determine the number of trusted nodes required for a given performance target.

GPSC is funded by the Agencia Estatal de Investigación (Spain) and the European Regional Development Fund (ERDF) under projects COMPASS (TEC2013-47020-C2-1-R), WINTER (TEC2016-76409-C2-2-R), MYRADA (TEC2016-75103-C2-2-R), COMONSENS (TEC2015-69648-REDC). Also funded by the Xunta de Galicia and the European Union (European Regional Development Fund - ERDF) under projects Agrupación Estratéxica Consolidada de Galicia accreditation 2016-2019 and Red Temática RedTEIC 2017-2018. Also funded by the EU H2020 Programme under project WITDOM (project no. 644371).